Rational Use of Fumed and Natural Oak Wood

Kuryanova, Tatyana; Tarasov, A. I.; Platonov, Aleksey; Snegireva, Svetlana

doi:10.34220/issn.2222-7962/2020.2/17

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…The study of physical and mechanical characteristics of bog oak at the age of 100-150 years has shown that these indicators completely coincide with those previously described [15][16][17]. Therefore, the main attention was paid to the physical and mechanical properties of bog oak with an age of 2500-3000 years.…”

Section: Figuresupporting

confidence: 72%

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Improving the quality of bog oak boards using microwave drying chambers

Шамаев

Медведев

Parinov

et al. 2022

J. Phys.: Conf. Ser.

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The stocks of bog oak taken from the bottom of reservoirs are increasingly used to preserve growing valuable species of wood, primarily oak. English oak (Quercus pedunculata Ehrh.) is a hard-drying species. Drying modes of oak boards have been well developed for both convection and microwave drying. The interest in bog oak, rose out from water bodies, sharply increased, but it turned out to be impossible to dry it using known methods other than microwave drying. Cracking defects are 70% at a thickness of 30 mm and 100% at a cross section of 60 mm. The article analyzes the results of bog oak drying in laboratory-type microwave chambers. The distance between magnetrons was 0.5 m, and a length of boards was 1.2 m. A semicommercial plant with a loading volume of 2 m3 and total power of 30 kW was used. Total drying time for boards with a total loading volume of 0.2 m3 was from 3 to 5 days. Cracking defects reduced to 20% for a thickness of 30 mm and to 32% for a thickness of 60 mm (with additional treatment by 40% carbamide solution). Board warping was not noticed.

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Section: Figuresupporting

confidence: 72%

“…It should be noted that shrinkage in bog oak (at the age of 2500-3000 years) in both directions is less than in natural one. And shrinkage in bog oak at the age of 100-150 years is much more according to [16,17].…”

Section: Figurementioning

confidence: 99%

Improving the quality of bog oak boards using microwave drying chambers

Шамаев

Медведев

Parinov

et al. 2022

J. Phys.: Conf. Ser.

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“…В ВГЛТУ выполнены исследования на древесине сосны, произрастающей в сухих борах лесостепной зоны России, после повреждения сильным низовым и беглым верховым пожаром [2][3][4]. В результате длительного мониторинга установлено, что у древесины в насаждениях, расположенных в сухих борах лесостепной зоны, после повреждения пожаром происходит снижение прочностных свойств гораздо быстрее, чем у древесины в насаждениях, произрастающих во влажных борах севера европейской части России.…”

Section: деревопереработка химические технологииunclassified

“…-С. 127-157 [1,4]. После указанного срока стояния на корню происходит существенное снижение прочностных показателей древесины.…”

Section: деревопереработка химические технологииunclassified

“…Коэффициент влагопроводности является основным показателем, характеризующим интенсивность потока влаги внутри древесины. Он характеризует количество влаги, перемещаемое в единицу времени через единицу площади при разности концентрации влаги в 1 кг/м 3 на 1 м толщины 4 . 34 Несмотря на то, что изучением передвижения влаги в твердых гигроскопических телах занималось немало исследователей, полной ясности в этом вопросе нет и до настоящего времени.…”

Section: деревопереработка химические технологииunclassified

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Heartwood moisture conductivity of standing pine damaged by running crown and strong surface wildfire

Platonov,

Snegireva,

Kantieva

et al. 2024

Forestry Engineering Journal

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The forest fire has an effect on the tree trunk. Of the total number of fires in the forest-steppe zone of Russia, strong grass-roots fires prevail. As a result of this type of fire, the undergrowth burns out, which contributes to the most prolonged exposure to high temperature on the lumpy, economically valuable part of the trunk. The effect of high temperature affects the structure of the anatomical elements of wood, its integrity is violated. In the standing timber of the Scots pine (Pinus sylvestris L.) destructive processes occur after fire damage, which have a significant effect on its physico-mechanical properties and are accompanied by intensive tar formation. One of the primary processes in wood processing technology is its dehydration, as a result of which wood is transformed from a natural material into a technological raw material. Therefore, the application of existing technological drying modes to wood damaged by fire is impractical. It is impossible to carry out the processes of dehydration or humidification of wood without information about the value of its moisture conductivity. The moisture conductivity of wood is determined by the moisture conductivity coefficient. The value of the moisture conductivity coefficient of samples of fire-damaged and undamaged P. sylvestris heartwood extracted from the stemwood was determined by the method of stationary moisture flow in the radial and tangential directions. In comparison with the intact Scots pine wood, wood damaged by fire has an inverse dependence of the intensity of the moisture current – in the tangential direction it is higher than in the radial direction. There is a general decrease in the moisture conductivity coefficient of pine wood: in the radial direction – by 40.2 ± 1.58% (p < 0.05), in the tangential direction – by 14.5 ± 0.92% (p < 0.05) compared with intact wood. Patterns of changes in the value of the heartwood coefficient of moisture conductivity in standing pine, damaged by fire, will allow to adjust the existing drying modes and improve the quality of the dried wood and the efficiency of the softwood kiln drying technology.

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Influence of Macrostructure on the Density of Oak Wood

Tarasov

Kuryanova

Platonov

et al. 2021

Forestry Engineering Journal

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An individual process of staining of each trunk occurs as a result of the long-term presence of wood in the river soil without oxygen access. It consists in changing the structure and chemical composition of the wood. There are industrial reserves of this wood on the territory of the Russian Federation, in the floodplains of a number of rivers. One of the most important tasks at the extraction stage is the primary individual quality assessment of the trunk. One of the most effective diagnostic indicators for assessing wood quality can be the number of annual layers in one centimeter. This indicator correlates well with wood density. The purpose of the research is to establish the influence of the macrostructure of natural wood and stained oak wood, changes in the microstructure on its density. It was found that the density of stained oak wood, depending on the number of annual layers in 1 cm, is about 10% higher than that of natural wood, all other things being equal. The magnitude and nature of the decrease in density along the radius of the trunk is the same as in natural wood. It is about 20%. The performed studies will allow making an express analysis of the quality of each stained wood trunk at the stage of making a decision on the behavior of its extraction. This will significantly reduce the cost of logging and primary processing of stained oak wood

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Rational Use of Fumed and Natural Oak Wood

Cited by 3 publications

References 8 publications

Improving the quality of bog oak boards using microwave drying chambers

Improving the quality of bog oak boards using microwave drying chambers

Heartwood moisture conductivity of standing pine damaged by running crown and strong surface wildfire

Influence of Macrostructure on the Density of Oak Wood

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